They believed that the minors had invaded their territory.
After World War l the United States stuck with a strict policy of isolationism. The American people didn’t want to be involved in European affairs. Accepting the refugees would’ve been a way for the U.S. to get dragged into the war. We see in the later years after the Imperial Japanese attacked Pearl Harbor where isolationism in the States becomes a distant memory and where the U.S. begins taking position on the world stage.
